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HK: Fachverband Physik der Hadronen und Kerne

HK 53: Structure and Dynamics of Nuclei XI

HK 53.5: Vortrag

Mittwoch, 13. März 2024, 18:45–19:00, HBR 19: C 5b

Resolving discrepancies in E2-excitation strengths of mid-shell tin isotopes — •M. Beuschlein¹, O. Papst¹, J. Kleemann¹, N. Pietralla¹, V. Werner¹, U. Ahmed¹, T. Beck^1,2, M. Berger¹, I. Brandherm¹, M.L. Cortes¹, A. D’Alessio¹, U. Friman-Gayer^1,3, I. Jurosevic¹, J. Hauf¹, M. Hilcker¹, K. E. Ide¹, J. Isaak¹, R. Kern¹, P. Koseoglou¹, C.M. Nickel¹, F. Niederschuh¹, K. Prifti¹, P. C. Ries¹, G. Steinhilber¹, T. Stetz¹, J. Vogel¹, J. Wiederhold¹, and R. Zidarova¹ — ¹IKP, TU Darmstadt, Germany — ²FRIB, East Lansing, MI, USA — ³ESS, Lund, Sweden

Data and theory for the electric quadrupole excitation strength of the proton closed-shell Sn isotopes show an enhancement of the B(E2, 0₁⁺ → 2₁⁺) values towards N=50, and a seniority-type behavior towards N=82. However, in the transitional region around N=66 various sets of data and theory differ significantly. In particular, lifetime data using the Doppler-shift attenuation method [1] are at variance with data from Coulomb excitation. In this work we present final results of a series of experiments on ^112,116,120Sn, utilizing the nuclear resonance fluorescence (NRF) technique, which offers a model-independent way of measuring E2 strengths. The new data generally support the trend measured in Coulomb excitation experiments, and is in favor of a smooth transition between the different regions.
Supported by the DFG through the research grants SFB 1245 and GRK 2891.

[1] A. Jungclaus et al., Phys. Lett. B 695, 110 (2011)